How does government change?

It can change by ... (read below)

Explanation:

The government can  place all or part of the state's most critical leadership system, administrative apparatus, or bureaucracy. It can be the deliberate product of outside force, as in warfare. Rollback is the military strategy to impose a regime change by defeating an enemy and removing its regime by force.

the system

Explanation:

balearic sea - is a body of water in the mediterranean sea around the balearic islands. baltic sea - is a mediterranean sea of the atlantic which is enclosed by scandinavian and baltic countries. barents sea - is a marginal sea in the artic ocean located off the northern coast of norway and russia.